154 research outputs found
Dynamical ordering of biomolecular systems for creation of integrated functions
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ã«äŸåããŠKaiAãšã®çžäºäœçšãæŠæ¥åšæçã«å€åããããšãèŠåºãã(Phase Dependent Differential Affinity: PDDAãšåä»ãã )ãKaiCã®ãªã³é
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Innovative nanoscience of supermolecular motor proteins working in biomembranes
é沢倧åŠçå·¥åŠåæ°ç©ç§åŠç³»å幎床ã«é«éAFMãçšããŠÎ±_3β_3è€åäœã§ATPå æ°Žå解ã«äŒŽãβãµããŠãããã®æ§é å€åãç»ååããããšã«æåãããæ¬å¹ŽåºŠã¯ãβãµããŠãããã®æ§é å€åã®è©³çŽ°ã調ã¹ååæ§ã®æç¡ãæããã«ããããã®èŠ³å¯ãäžå¿ã«è¡ã£ããSPMã·ãã¥ã¬ãŒã¿ãçšããŠÎ±_3β_3è€åäœã®çµæ¶æ§é ã¢ãã«ããAFMç»åãåæ§æããçµæãATPéååšäžã§ã¯Î±_3β_3è€åäœãªã³ã°æ§é ã®ãã¡Î²ã¯Î±ããå¹åžãé«ã芳å¯ãããããšãåãããå®éã«èŠ³å¯ãããAFMåãšè¯ãäžèŽãããäžæ¹ãAMP-PNPååšäžã§èŠ³å¯ãããAFMåã¯ãäžã€ã®Î²ãéç¶æ
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ã§ATPå æ°Žå解ã®ååæ§ãååšããããšã瀺ããŠãããαãããã¯Î²ãæ¬ æããå Žåãæ§é å€åã®é »åºŠãäžãããæ¹åæ§ãæ¶å€±ããããšããããµããŠãããã®æ§é å€åãä»ããŠååæ§ãçºæ®ãããŠãããšèãããããç 究課é¡/é åçªå·:21023010, ç 究æé(幎床):2009 â 201
High-speed atomic force microscopy
The technology of high-speed atomic force microscopy (HS-AFM) has reached maturity. HS-AFM enables us to directly visualize the structure and dynamics of biological molecules in physiological solutions at subsecond to sub-100 ms temporal resolution. By this microscopy, dynamically acting molecules such as myosin V walking on an actin filament and bacteriorhodopsin in response to light are successfully visualized. Highresolution molecular movies reveal the dynamic behavior of molecules in action in great detail. Inferences no longer have to be made from static snapshots of molecular structures and from the dynamic behavior of optical markers attached to biomolecules. In this review, we first describe theoretical considerations for the highest possible imaging rate, then summarize techniques involved in HS-AFM and highlight recent imaging studies. Finally, we briefly discuss future challenges to explore. © 2012 The Japan Society of Applied Physics
Science on Function of Soft Molecular Systems by Cooperation of Theory and Experiment
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High-speed atomic force microscopy for nano-visualization of dynamic biomolecular processes
é沢倧åŠçå·¥ç 究åæ°ç©ç§åŠç³»The atomic force microscope (AFM) has a unique capability of allowing the high-resolution imaging of biological samples on substratum surfaces in physiological solutions. Recent technological progress of AFM in biological research has resulted in remarkable improvements in both the imaging rate and the tip force acting on the sample. These improvements have enabled the direct visualization of dynamic structural changes and dynamic interactions occurring in individual biological macromolecules, which is currently not possible with other techniques. Therefore, high-speed AFM is expected to have a revolutionary impact on biological sciences. In addition, the recently achieved atomic-resolution in liquids will further expand the usefulness of AFM in biological research. In this article, we first describe the various capabilities required of AFM in biological sciences, which is followed by a detailed description of various devices and techniques developed for high-speed AFM and atomic-resolution in-liquid AFM. We then describe various imaging studies performed using our cutting-edge microscopes and their current capabilities as well as their limitations, and conclude by discussing the future prospects of AFM as an imaging tool in biological research. © 2008 Elsevier Ltd. All rights reserved
Science on Function of Soft Molecular Systems by Cooperation of Theory and Experiment
é沢倧åŠçå·¥ç 究åæ°ç©ç§åŠç³»æšå¹ŽåºŠãŸã§ã«éçºããé«éAFMã€ã³ã¿ã©ã¯ãã£ãã¢ãŒãã®å¿çšç 究ãé²ãããå
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Video-rate high-speed atomic force microscopy for biological sciences
é沢倧åŠçå·¥ç 究åæ°ç©ç§åŠç³»The atomic force microscope (AFM) is unique in its capability to capture high-resolution images of biological samples in liquids. This capability becomes more valuable to biological sciences if AFM additionally acquires an ability of high-speed imaging. "Direct and real-time visualization" is a straightforward and powerful means of understanding biomolecular processes. With conventional AFM, it takes more than a minute to capture an image, while biomolecular processes generally occur on a millisecond timescale. In order to fill this large gap,various efforts have been carried out in the past decade. Here, we review these past efforts, describe the current state of the capability and limitations of our high-speed AFM, and discuss possibilities that may break the limitations, leading to an innovative high-speed bioAFM
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Method of mechanical holding of cantilever chip for tip-scan high-speed atomic force microscope
In tip-scan atomic force microscopy (AFM) that scans a cantilever chip in the three dimensions, the chip body is held on the Z-scanner with a holder. However, this holding is not easy for high-speed (HS) AFM because the holder that should have a small mass has to be able to clamp the cantilever chip firmly without deteriorating the Z-scanner\u27s fast performance, and because repeated exchange of cantilever chips should not damage the Z-scanner. This is one of the reasons that tip-scan HS-AFM has not been established, despite its advantages over sample stage-scan HS-AFM. Here, we present a novel method of cantilever chip holding which meets all conditions required for tip-scan HS-AFM. The superior performance of this novel chip holding mechanism is demonstrated by imaging of the α3β3 subcomplex of F1-ATPase in dynamic action at âŒ7 frames/s. © 2015 AIP Publishing LLC
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